ApplicationsL-Histidine monohydrochloride monohydrate is used as a precursor through histidine decarboxylase. It is also used to study the cultures of the human T-lymphoblastic leukemia cell line, modulation of apoptosis. It is also used to enhance the biosynthesis of Lovastatin by cultured aspergillus terreus. It is utilized as a single nitrogen source to probe swarming in Pseudomonas aeruginosa on agar. It is employed as a component to avoid the risk of contaminating bioproducts with adventitious viruses.